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Re: port-xen/53074: Daily 8.99.12 DOMU panic

The following reply was made to PR port-xen/53074; it has been noted by GNATS.

From: Brad Spencer <>
Subject: Re: port-xen/53074: Daily 8.99.12 DOMU panic
Date: Fri, 10 Aug 2018 15:54:25 -0400

 Sorry..  I had not noticed that there was a reply to this.  I updated
 the DOMU guest that has the panic to 8.99.23 and it still does it.
 However, the backtrace may be more useful.  I suspect that the bug I
 found was noted again by someone else recently and may be the same as
 the more recent kern/53506.  In any case, here is a new backtrace:
 [ 1085.6009218] panic: biodone2 already
 [ 1085.6009218] cpu0: Begin traceback...
 [ 1085.6009218] vpanic() at netbsd:vpanic+0x152
 [ 1085.6009218] snprintf() at netbsd:snprintf
 [ 1085.6009218] biointr() at netbsd:biointr
 [ 1085.6009218] biointr() at netbsd:biointr+0x5b
 [ 1085.6009218] softint_thread() at netbsd:softint_thread+0x97
 [ 1085.6009218] cpu0: End traceback...
 [ 1085.6009218] fatal breakpoint trap in supervisor mode
 [ 1085.6009218] trap type 1 code 0 rip 0xffffffff80205855 cs 0xe030 rflags 0x202 cr2 0xffffa0002b88d267 ilevel 0 rsp 0xffffa0002b359dc0
 [ 1085.6009218] curlwp 0xffffa00000743000 pid 0.4 lowest kstack 0xffffa0002b3552c0
 Stopped in pid 0.4 (system) at  netbsd:breakpoint+0x5:  leave
 breakpoint() at netbsd:breakpoint+0x5
 vpanic() at netbsd:vpanic+0x152
 snprintf() at netbsd:snprintf
 biointr() at netbsd:biointr
 biointr() at netbsd:biointr+0x5b
 softint_thread() at netbsd:softint_thread+0x97
 ds          ffff
 es          0
 fs          9dd0
 gs          9d70
 rdi         0
 rsi         a
 rbp         ffffa0002b359dc0
 rbx         104
 rdx         1
 rcx         0
 rax         0
 r8          ffffffff80704540    cpu_info_primary
 r9          cccccccccccccccd
 r10         75
 r11         ffffffff805d97f8    ptp_shifts+0x18
 r12         ffffffff8065dd8f    ostype+0x463af
 r13         ffffa0002b359e08
 r14         ffffffff8065dc25    ostype+0x46245
 r15         ffffa00000743000
 rip         ffffffff80205855    breakpoint+0x5
 cs          e030
 rflags      202
 rsp         ffffa0002b359dc0
 ss          e02b
 netbsd:breakpoint+0x5:  leave
 This panic is being tripped by a line much line this:
 /sbin/dump -0u -a -f - / | ssh backup@backupsystem "/usr/pkg/bin/buffer | /usr/bin/bzip2 -9c > /sp/HOSTS/domu_guest_that_panics/x.bz2"
 Brad Spencer - - KC8VKS -

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